How to Enable 'Do Not Disturb' on Ubuntu 20.04 LTS?

Step 1: Click on 'Clock' in the top middle.

Step 2: Now in Message Tray, Click on 'Toggle' next to 'Do Not Disturb' to Enable it.

Step 3: Click again on 'Clock' in the top middle in order to close the message tray.

It's done.

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